Trane Axiom GEH006, Manual

Page: 12 / 144

12 WSHP-PRC001-EN
Boilerless Control/Electric Heat
(option)
In cooling dominant regions where
heat may be used 15 to 30 days out of
the winter season, eliminating the
boiler may be an economical advan-
tage to the building owner. Eliminat-
ing a boiler from the system reduces
costs associated with the mechanical
system installation, as well as the
maintenance and service of the boiler.
How can heat be provided for the few
days of the year when heat is neces-
sary? Through the water-source heat
pump of course. The advantage of the
water-source heat pump is it’s ability
to provide heat recovery within the
closed water-loop. While some
WSHPs may be extracting heat from
the closed water loop, other WSHPs
may be adding heat to the closed
water loop. This creates a perfect sys-
tem balance for heat sharing or move-
ment from one space to another.
But when water temperatures fall in a
boilerless system, and no further heat
recovery may be made via the closed
loop, heat may be added to the space
through a boilerless control electric
heat option. See
Figure 20
for the
boilerless control, electric heat system
diagram.
With the boilerless electric heat
option, the heat pump encompasses
an internal nichrome open wire heat-
ing element (factory mounted and
wired in the 1/2 through 5-ton models)
It is comprised of a single stage of
electric heat designed to invoice an
electric heater in place of the com-
pressor in the event entering water
temperature falls below 55 F or a field
adjusted temperature setting between
25 F to 60 F.
The 12 1/2 through 25-ton GEV model
will contain the boilerless controls
ONLY to interface for a field provided
supplemental electric heat selection.
The heater for this model shall be
placed external to the equipment by
the contractor for ease of installation.
All power connections for the electric
heater will be completely separate
from the unit for field supplied electric
heat.
Features and
Benefits
Figure 20: Boilerless control, electric heat system